A ________ is an open channel inside a tubular structure, such as the esophagus, small intestine, and large intestine.

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Lumen refers to the open channel inside a tubular structure, such as the esophagus, small intestine, and large intestine. Haustra are the pouches present in the large intestine. Sphincter refers to the circular muscles present at the junction of two organs, responsible for opening and closing of the passage. Fundus is the upper part of the stomach.

A ________ Is an Open Channel Inside a Tubular Structure